Number of pubsub hierarchy levels

up to how many hierarchy levels does openfire support?

I noticed that up to three levels are supported for collections like /Collection/Subcollection/Subsubcollection .

And up to four levels if the fourth is a leaf like /Collection/Subcollection/Subsubcollection/Leaf .

Is that right or do I have to modify the configuration or something in order to store on more than three levels.

Actually it I was able to create more levels like /Collection/subcollection/subsubcollection/subsubsubcollection/leaf but after the server restart I noticed that collection nodes deeper than the third level were not retrievable anymore although they appeared to be in the database…